Phylogeny and divergence of Chinese Angiopteridaceae based on chloroplast DNA sequence data (rbcL and trnL-F)  

作　　者：LI ChunXiang LU ShuGang 

机构地区：[1]State Key Laboratory of Palaeobiology and Stratigraphy of Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China [2]Insttute of Ecology and Geobotany, Yunnan University, Kunming 650091, China

出　　处：《Chinese Science Bulletin》2007年第1期91-97,共7页

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 40302003 & 30370116)

摘　　要：Marattioid ferns are an ancient lineage of primitive vascular plants that first appeared in the middle Carboniferous. Extant members are almost exclusively restricted to tropical regions, and the spe- cies-rich family Angiopteridaceae are limited in their distribution to the eastern hemisphere; relation- ships within the group are currently vague. Here the phylogenetic relationship between Angiopteris Hoffm. and Archangiopteris Christ et Gies. was evaluated based on the sequence analysis of chloro- plast rbcL gene and trnL-F intergenic spacer with MEGA2 and MrBayes v3.0b4. On the basis of the phy- logenetic pattern and fossil record, we further estimated the divergence time for the two genera. The phy- logenetic trees revealed that all species of Angiopteris and Archangiopteris in this study formed a monophyletic group with strong statistical support, but the relationship between the two genera re- mained unresolved based on individual sequence analysis. On the other hand, the sequence analyses of combined data set revealed that Archangiopteris species diverged first, indicating that Archangiop- teris may not be a direct derivative as traditionally assumed. The clade of Angiopteris and Archan- giopteris appears to have diversified in the late Oligocene (≈26 Ma) based on the molecular estimate. Thus, the evolutionary history of extant Angiopteris and Archangiopteris has been characterized by ancient origin and recent diversification, and these groups are not relic and endangered lineages as traditionally considered.Marattioid ferns are an ancient lineage of primitive vascular plants that first appeared in the middle Carboniferous. Extant members are almost exclusively restricted to tropical regions, and the specles-rich family Angiopteridaceae are limited in their distribution to the eastern hemisphere; relationships within the group are currently vague. Here the phylogenetic relationship between Angiopterls Hoffm. and Archangiopteris Christ et Gies. was evaluated based on the sequence analysis of chloroplast rbcL gene and trnL-F intergenic spacer with MEGA2 and MrBayes v3.064. On the basis of the phyIogenetic pattam and fossil record, we further estimated the divergence time for the two genera. The phylogenetic trees revealed that all species of Angiopteris and Archangiopteris in this study formed a monophyletic group with strong statistical support, but the relationship between the two genera remined unresolved based on individual sequence analysis. On the other hand, the sequence analyses of combined data set revealed that Archangiopteris species diverged first, indicating that Archangiop teris may not be a direct derivative as traditionally assumed. The clade of Angiopterls and Archangiopteris appears to have diversified in the late Oligocene （=26 Ma） based on the molecular estimate. Thus, the evolutionary history of extant Angiopteris and Archangiopteris has been characterized by ancient origin and recent diversification, and these groups are not relic and endangered lineages as traditionally considered.

关 键 词：RBCL DNA 中国 遗传学 

分 类 号：Q3[生物学—遗传学]